Cologne, New Jersey has a Humid Continental Hot Summers With Year Around Precipitation climate (Köppen classification: Dfa). Average annual temperatures range from 7 °C (low) to 18 °C (high). Annual precipitation averages 1209.6 Millimeters. Cologne is located in USDA Plant Hardiness Zone 7a. The growing season typically runs from the last frost around Apr. 11 - Apr. 20 through the first frost around Oct. 21 - Oct. 31.
| Month | Avg. Low | Avg. High | Avg. Precip |
|---|---|---|---|
| January | -4.4 °C | 5.8 °C | 91.95 mm |
| February | -3.8 °C | 7.1 °C | 77.72 mm |
| March | 0 °C | 10.9 °C | 119.38 mm |
| April | 5.4 °C | 16.9 °C | 91.19 mm |
| May | 10.8 °C | 22.1 °C | 88.65 mm |
| June | 16 °C | 27.1 °C | 96.52 mm |
| July | 19.1 °C | 29.8 °C | 118.87 mm |
| August | 18.1 °C | 28.8 °C | 118.62 mm |
| September | 14.4 °C | 25.5 °C | 97.03 mm |
| October | 7.7 °C | 19.3 °C | 106.43 mm |
| November | 2.1 °C | 13.7 °C | 89.15 mm |
| December | -1.7 °C | 8.6 °C | 114.05 mm |
| Annual | 7 °C | 18 °C | 1209.56 mm |
| Average First Frost Date | Oct. 21 - Oct. 31 |
| Average Last Frost Date | Apr. 11 - Apr. 20 |
| Average Days With Frost | 75-100 Days |
| Plant Hardiness Zone | Zone 7a : -17.8°C to -15°C |
| Plant Hardiness Zone - 2012 | Zone 7a : -17.8°C to -15°C |
| Current Drought Conditions | Severe Drought |
| Köppen Climate Classification | Dfa - Humid Continental Hot Summers With Year Around Precipitation |